Mercurial > projects > dwt-win
view dwt/dnd/TreeDragSourceEffect.d @ 135:242e33c0e383
Added dnd source, ByteArrayTransfer,Clipboard completed
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 13 Feb 2008 04:51:22 +0100 |
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children | 04e357b8343d |
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/******************************************************************************* * Copyright (c) 2007 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.dnd.TreeDragSourceEffect; import dwt.DWT; import dwt.graphics.Image; import dwt.graphics.Rectangle; import dwt.internal.win32.OS; import dwt.widgets.Display; import dwt.widgets.Tree; import dwt.widgets.TreeItem; /** * This class provides default implementations to display a source image * when a drag is initiated from a <code>Tree</code>. * * <p>Classes that wish to provide their own source image for a <code>Tree</code> can * extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code> * method and set the field <code>DragSourceEvent.image</code> with their own image.</p> * * Subclasses that override any methods of this class must call the corresponding * <code>super</code> method to get the default drag under effect implementation. * * @see DragSourceEffect * @see DragSourceEvent * * @since 3.3 */ public class TreeDragSourceEffect : DragSourceEffect { Image dragSourceImage = null; /** * Creates a new <code>TreeDragSourceEffect</code> to handle drag effect * from the specified <code>Tree</code>. * * @param tree the <code>Tree</code> that the user clicks on to initiate the drag */ public this(Tree tree) { super(tree); } /** * This implementation of <code>dragFinished</code> disposes the image * that was created in <code>TreeDragSourceEffect.dragStart</code>. * * Subclasses that override this method should call <code>super.dragFinished(event)</code> * to dispose the image in the default implementation. * * @param event the information associated with the drag finished event */ public void dragFinished(DragSourceEvent event) { if (dragSourceImage !is null) dragSourceImage.dispose(); dragSourceImage = null; } /** * This implementation of <code>dragStart</code> will create a default * image that will be used during the drag. The image should be disposed * when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code> * method. * * Subclasses that override this method should call <code>super.dragStart(event)</code> * to use the image from the default implementation. * * @param event the information associated with the drag start event */ public void dragStart(DragSourceEvent event) { event.image = getDragSourceImage(event); } Image getDragSourceImage(DragSourceEvent event) { if (dragSourceImage !is null) dragSourceImage.dispose(); dragSourceImage = null; Tree tree = (Tree) control; TreeItem[] selection = tree.getSelection(); if (selection.length is 0) return null; int treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0); if (treeImageList !is 0) { int count = Math.min(selection.length, 10); Rectangle bounds = selection[0].getBounds(0); for (int i = 1; i < count; i++) { bounds = bounds.union(selection[i].getBounds(0)); } int hDC = OS.GetDC(0); int hDC1 = OS.CreateCompatibleDC(hDC); int bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height); int hOldBitmap = OS.SelectObject(hDC1, bitmap); RECT rect = new RECT(); rect.right = bounds.width; rect.bottom = bounds.height; int hBrush = OS.GetStockObject(OS.WHITE_BRUSH); OS.FillRect(hDC1, rect, hBrush); for (int i = 0; i < count; i++) { TreeItem selected = selection[i]; Rectangle cell = selected.getBounds(0); int imageList = OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle); OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED); OS.ImageList_Destroy(imageList); } OS.SelectObject(hDC1, hOldBitmap); OS.DeleteDC (hDC1); OS.ReleaseDC (0, hDC); Display display = tree.getDisplay(); dragSourceImage = Image.win32_new(display, DWT.BITMAP, bitmap); return dragSourceImage; } return null; } }